book Maths Puzzle Numerical Ability

A coffee house has 20 lbs. of coffee that sells for $4 per pound. How many pounds of coffee that sells for $8 per pound should be mixed with the 20 pounds of $4 coffee to obtain a

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book Other Question
A skatebooard ramp is inclined 30 degrees up from the ground. If you move 15 feet up the ramp, how high above the ground are you? If P=x+1/x-1 and Q=x-1/x+1, find P^2+Q^2-PQ.